An inner and outer weld polishing device for thin-wall stainless steel water pipe machining

Abstract

The present application provides a kind of inner and outer weld polishing device for thin-wall stainless steel water pipe processing, belong to stainless steel water pipe welding technical field, for solving the technical problem of existing stainless steel water pipe polishing device high polishing difficulty, low polishing efficiency. Including outer sleeve and inner sleeve, outer sleeve is equipped with outer moving mechanism and first magnetic block, first rotating cylinder is rotatably arranged on the inner side of outer sleeve, a plurality of outer polishing pieces are arranged on the inner side of first rotating cylinder, inner moving mechanism and second magnetic block are arranged at the both ends of inner sleeve, second rotating cylinder is rotatably arranged on the outer side of inner sleeve, a plurality of inner polishing pieces are arranged on the outer side of second rotating cylinder, a tension spring is arranged between the inner polishing pieces and the second rotating cylinder, and a limiting mechanism is arranged on the second rotating cylinder. The present application is convenient to position, has low polishing difficulty, can polish inner and outer weld at the same time, has high polishing efficiency. It can adapt to stainless steel pipes of different diameters, expand the application range of the device. The device has high stability during polishing, and has good polishing effect.

Description

Technical Field

[0001] This invention belongs to the field of stainless steel water pipe welding technology, and relates to a device for grinding internal and external weld seams in the processing of thin-walled stainless steel water pipes. Background Technology

[0002] Stainless steel water pipes are characterized by a very low leakage rate, which can save precious water resources. In the 1980s, the leakage rate of water pipes was about 17%, but after switching to stainless steel water pipes, the leakage rate dropped to 7%. Stainless steel water pipes have various connection methods, among which the welding connection method uses a hot-melt process to fuse two connecting parts together to achieve a connection effect. The connection strength is high, but the welding difficulty is high, and the installation quality is highly dependent on the welding worker's skills.

[0003] Stainless steel water pipes come in various types with different materials, diameters, and wall thicknesses. For larger diameter stainless steel water pipes, the inner and outer welds need to be ground after welding to make the surface smoother, improve its performance, and extend its service life. However, when the pipe is long, it is difficult to determine whether the grinding disc is aligned with the inner weld, making grinding more difficult and less efficient.

[0004] Based on this, we designed a device for grinding internal and external weld seams in the processing of thin-walled stainless steel water pipes. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a grinding device for internal and external weld seams in the processing of thin-walled stainless steel water pipes. The technical problem to be solved by this device is: how to reduce the grinding difficulty of stainless steel water pipes and improve grinding efficiency.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A grinding device for internal and external weld seams in thin-walled stainless steel water pipe processing includes an outer sleeve and an inner sleeve. The outer sleeve has several equally spaced external moving mechanisms on both sides, each containing a first magnetic block. A first rotating cylinder is rotatably mounted inside the outer sleeve, and an external gear ring is mounted on the outer side of the first rotating cylinder. A first motor is fixed to the outer side of the outer sleeve, and a first gear is fixed to the output shaft of the first motor. A first through hole is provided on the outer sleeve, through which the first gear meshes with the external gear ring. Several first electric push rods are fixed to the inner side of the first rotating cylinder, and an external grinding disc is fixed to the end of each first electric push rod. Internal moving mechanisms are located at both ends of the inner sleeve. The inner moving mechanism is equipped with several second magnetic blocks. A second rotating cylinder is rotatably mounted on the outer side of the inner sleeve. Several inner grinding discs are mounted on the outer side of the second rotating cylinder. Two sliding rods are fixed on the inner side of the inner grinding discs, and sliding sleeves are slidably mounted on the sliding rods. The ends of the sliding sleeves are fixed to the second rotating cylinder. A tension spring is mounted on the outer side of the sliding sleeve. The two ends of the tension spring are fixedly connected to the inner grinding discs and the second rotating cylinder, respectively. A limiting mechanism is provided on the second rotating cylinder. A second motor is fixed on the inner side of the inner sleeve, and a second gear is fixed on the output shaft of the second motor. An internal gear ring is provided on the inner side of the second rotating cylinder. A second through hole is opened on the inner sleeve, and the second gear passes through the second through hole and meshes with the internal gear ring.

[0008] The working principle of this invention is as follows: In use, the outer sleeve is placed on the outside of the stainless steel water pipe to be polished. Under the push of the operator, it moves along the outer wall of the stainless steel water pipe through the outer moving mechanism. The inner sleeve is placed on the inside of the stainless steel water pipe and moves along the inside of the stainless steel water pipe through the inner moving mechanism. At the same time as the outer sleeve moves, the first magnetic block pulls the second magnetic block through magnetic force, causing the inner sleeve to move synchronously. When the operator pushes the outer sleeve to the weld, the inner sleeve also moves synchronously to the weld. At this time, the first electric push rod drives the outer polishing disc to fit against the pipe wall. The first motor drives the first rotating cylinder to rotate through the first gear and the outer gear ring, so that the outer polishing disc polishes the outside of the pipe wall. At the same time, the second motor drives the second rotating cylinder to rotate through the second gear and the inner gear ring. Under the action of centrifugal force, the inner polishing disc overcomes the tension of the tension spring and moves outward. Under the action of the limiting mechanism, it fits against the inside of the pipe wall to polish the weld.

[0009] The external moving mechanism further includes a first rotating rod, a second rotating rod, a connecting rod, and an external moving wheel. An installation groove is provided at the end of the outer sleeve. The first rotating rod and the second rotating rod are rotatably connected to the side wall of the installation groove. The two ends of the connecting rod are respectively hinged to the ends of the first rotating rod and the second rotating rod. The external moving wheel is rotatably set at the hinge position between the first rotating rod and the connecting rod. A locking component is provided at the upper end of the first rotating rod. The first magnetic block is fixed on the connecting rod, and an external fixing bolt is threaded onto the first magnetic block.

[0010] With the above structure, during use, the operator can adjust the angle of the first rotating rod according to the specifications of the stainless steel water pipe to be polished and fix it with the locking component, so that the outer moving wheel is in contact with the outer side of the pipe wall. At this time, under the action of the connecting rod and the second rotating rod, the first magnetic block is in contact with the outer side of the outer wall. After moving to the polishing position, the operator can tighten the outer fixing bolt to increase the friction between it and the stainless steel water pipe, thereby achieving the effect of fixing the outer sleeve and making the outer sleeve more stable during the polishing process.

[0011] The locking assembly includes a sector plate and a locking bolt. The sector plate is fixed inside the mounting groove and has several equally spaced adjustment holes. The first rotating rod has a locking hole aligned with one of the adjustment holes. The locking bolt is threaded into the adjustment hole and the end of the locking bolt is inserted into the locking hole.

[0012] Using the above structure, the angle of the first rotating rod is adjusted according to the specifications of the stainless steel water pipe so that the locking hole is aligned with the adjustment holes at different positions. Then, the locking bolt is used to restrict the position of the locking hole, which can achieve the effect of fixing the first rotating rod.

[0013] The inner moving mechanism includes a fixing component and fixing covers fixed at both ends of the inner sleeve. Each fixing cover is threaded with a threaded rod, and a synchronization component is provided between the two threaded rods. A connecting piece is rotatably provided at one end of the threaded rod located outside the inner sleeve. Several circumferentially distributed hinge seats are fixed at both ends of the inner sleeve. A third rotating rod is hinged to the hinge seat, and an inner moving wheel is rotatably connected to the end of the third rotating rod. A fourth rotating rod is hinged to the connecting piece, and the middle position of the fourth rotating rod is hinged to the corresponding position of the third rotating rod.

[0014] With the above structure, during use, the operator can place the inner sleeve inside the stainless steel water pipe, and then adjust the two threaded rods through the synchronization component. As the threaded rods rotate, they will retract into the inner sleeve. At this time, the third rotating rod can be pushed outward by the fourth rotating rod, so that the inner moving wheel opens outward and abuts against the inner wall of the pipe. At this time, the inner sleeve is squeezed and moves along the inside of the pipe.

[0015] The fixing assembly includes two fixing sleeves and several rubber anti-slip plates. The second magnetic block is rotatably connected to the end of the fourth rotating rod. An auxiliary rod is hinged to the second magnetic block, and the other end of the auxiliary rod is hinged to the connector. The auxiliary rod is parallel to the fourth rotating rod. A groove is provided on the outer side of the second magnetic block. The rubber anti-slip plates are fixed at the opening of the groove. A connecting hole is provided on the inner wall of the groove. The fixing sleeve is fixed on the inner wall of the inner sleeve, and the axes of the two fixing sleeves are collinear. A piston is slidably arranged inside the fixing sleeve, and a second electric push rod is arranged between the two pistons. The two ends of the second electric push rod are fixedly connected to the two pistons respectively. A vent pipe is connected to the end of the fixing sleeve away from the second electric push rod. An annular tube is fixed inside the fixing cover. Several branch pipes are connected to the annular tube. Several round holes are provided on the inner sleeve, and the other end of the branch pipe passes through the round hole at the corresponding position and connects to the connecting hole at the corresponding position. The end of the vent pipe away from the fixing sleeve is connected to the annular tube.

[0016] With the above structure, when the inner sleeve moves to the appropriate position, the second electric push rod drives the two pistons to disperse on both sides, squeezing the gas inside the fixed sleeve into the groove through the vent pipe, annular pipe and branch pipe. At this time, the gas pressure inside the groove increases, squeezing the rubber anti-slip sheet outward, so that the rubber anti-slip sheet is tightly attached to the inner wall of the stainless steel water pipe, thereby fixing the inner sleeve.

[0017] The synchronization component includes a central rod and two clamping rods. The central rod is fixed to one of the threaded rods, and the two clamping rods are symmetrically fixed to the other threaded rod. The end of the central rod is located between the two clamping rods. Slider blocks are fixed on both sides of the central rod, and a groove is opened on the side of the clamping rod near the central rod. The slider is slidably set in the groove at the corresponding position. An adjusting wheel is connected to one of the threaded rods.

[0018] With the above structure, when the operator rotates the adjusting wheel, one of the threaded rods rotates, and under the action of the central rod and the clamping rod, the two threaded rods rotate synchronously. Moreover, when the two threaded rods move axially, the slider can slide along the slide groove without hindering the movement of the threaded rods.

[0019] The limiting mechanism includes an annular plate with several arc-shaped grooves. Several limiting bolts are threaded onto the second rotating cylinder, and the limiting bolts pass through the arc-shaped grooves. Several stepped grooves are provided on the inner side of the annular plate. An L-shaped rod is connected to the end of the inner grinding disc, and the bottom of the L-shaped rod is located in the stepped groove.

[0020] Using the above structure, depending on the specifications of the stainless steel water pipe, the operator can loosen the limiting bolts, then rotate the annular plate to align the bottom of the L-shaped rod with different positions of the stepped groove, and then tighten the limiting bolts to fix the annular plate. During the rotation of the second rotating cylinder, when the inner grinding disc expands outward under the action of centrifugal force, the L-shaped rod will move accordingly. When the bottom of the L-shaped rod abuts against the side wall of the stepped groove, it will hinder the outward expansion of the inner grinding disc, so that the maximum rotation diameter of the inner grinding disc is consistent with the inner diameter of the stainless steel water pipe, preventing over-grinding.

[0021] Compared with existing technologies, this grinding device for internal and external weld seams in thin-walled stainless steel water pipe processing has the following advantages:

[0022] 1. Through the outer sleeve, inner sleeve, first magnetic block, second magnetic block, outer grinding disc and inner grinding disc, the operator can move the outer grinding disc and inner grinding disc to the weld position at the same time, which facilitates positioning, reduces grinding difficulty, and can grind the inner and outer welds at the same time, thus improving grinding efficiency.

[0023] 2. Through the external and internal moving mechanisms, the device can move more stably along the stainless steel water pipe and can adapt to stainless steel pipes of different diameters, thus expanding the applicability of the device.

[0024] 3. The inner sleeve is fixed by a fixing component, which improves the stability of the device during grinding and ensures the grinding effect.

[0025] 4. By using a limiting mechanism, the outward expansion range of the inner grinding disc is limited, so that the inner grinding disc will not excessively grind the inner wall of the stainless steel pipe. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 This is a schematic diagram of the external moving mechanism in this invention;

[0028] Figure 3 This is a cross-sectional view of the outer sleeve in this invention;

[0029] Figure 4 This is a schematic diagram of the structure of the inner sleeve and its connecting components in this invention;

[0030] Figure 5 This is a schematic diagram of the internal structure of the inner sleeve in this invention;

[0031] Figure 6 This is a cross-sectional view of the second magnetic block in this invention;

[0032] Figure 7 This is a schematic diagram of the split structure of the synchronization component in this invention;

[0033] Figure 8 This is the present invention. Figure 4 Enlarged structural diagram at point A;

[0034] In the diagram: 1. Outer sleeve; 2. Inner sleeve; 3. Outer moving mechanism; 301. Mounting groove; 302. First rotating rod; 303. Second rotating rod; 304. Outer moving wheel; 305. Connecting rod; 306. First magnet; 307. Outer fixing bolt; 308. Sector plate; 309. Adjusting hole; 310. Locking hole; 311. Locking bolt; 4. First rotating cylinder; 5. Outer gear ring; 6. First motor; 7. First through hole; 8. First gear; 9. First electric push rod; 10. Outer grinding disc; 11. Inner moving mechanism; 1101. Fixing cover; 1102. Threaded rod; 1103. Connector; 1104. Hinge seat; 1105. Fourth rotating rod; 1106. Inner moving wheel; 1107. Second magnet; 1108. Auxiliary rod; 110 9. Groove; 1110. Rubber anti-slip sheet; 1111. Connecting hole; 1112. Annular tube; 1113. Support; 1114. Fixing sleeve; 1115. Vent pipe; 1116. Piston; 1117. Second electric push rod; 1118. Round hole; 1119. Center rod; 1120. Slider; 1121. Clamping rod; 1122. Slide groove; 1123. Adjusting wheel; 1124. Third rotating rod; 12. Second rotating cylinder; 13. Sliding sleeve; 14. Sliding rod; 15. Inner grinding disc; 16. Tension spring; 17. Inner gear ring; 18. Second motor; 19. Second gear; 20. Second through hole; 21. Limiting mechanism; 2101. Annular plate; 2102. Arc groove; 2103. Limiting bolt; 2104. Stepped groove; 2105. L-shaped rod. Detailed Implementation

[0035] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0036] The embodiments of this patent are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this patent, and should not be construed as limiting this patent.

[0037] In the description of this patent, it should be understood that the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0038] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0039] Please see Figure 1-8This embodiment provides a grinding device for internal and external weld seams in thin-walled stainless steel water pipe processing, including an outer sleeve 1 and an inner sleeve 2. Several equally spaced external moving mechanisms 3 are provided on both sides of the outer sleeve 1, and a first magnetic block 306 is provided in each of the external moving mechanisms 3. A first rotating cylinder 4 is rotatably mounted on the inner side of the outer sleeve 1, and an external gear ring 5 is provided on the outer side of the first rotating cylinder 4. A first motor 6 is fixed to the outer side of the outer sleeve 1, and a first gear 8 is fixed on the output shaft of the first motor 6. A first through hole 7 is provided on the outer sleeve 1, through which the first gear 8 passes and meshes with the external gear ring 5. Several first electric push rods 9 are fixed to the inner side of the first rotating cylinder 4. Furthermore, an outer grinding disc 10 is fixed to the end of the first electric actuator 9, and an inner moving mechanism 11 is provided at both ends of the inner sleeve 12. Several second magnetic blocks 1107 are provided in the inner moving mechanism 11. A second rotating cylinder 12 is rotatably mounted on the outer side of the inner sleeve 2, and several inner grinding discs 15 are provided on the outer side of the second rotating cylinder 12. Two sliding rods 14 are fixed to the inner side of the inner grinding discs 15, and sliding sleeves 13 are slidably mounted on the sliding rods 14. The ends of the sliding sleeves 13 are fixed to the second rotating cylinder 12, and tension springs 16 are sleeved on the outer side of the sliding sleeves 13. The two ends of the tension springs 16 are respectively fixedly connected to the inner grinding discs 15 and the second rotating cylinder 12, and a limiting mechanism is provided on the second rotating cylinder 12. 21. A second motor 18 is fixed inside the inner sleeve 2, and a second gear 19 is fixed on the output shaft of the second motor 18. An internal gear ring 17 is provided inside the second rotating cylinder 2, and a second through hole 20 is opened on the inner sleeve 2. The second gear 19 passes through the second through hole 20 and meshes with the internal gear ring 17. In use, the outer sleeve 1 is placed on the outside of the stainless steel water pipe to be polished. Under the push of the operator, it moves along the outer wall of the stainless steel water pipe through the outer moving mechanism 3. The inner sleeve 2 is placed inside the stainless steel water pipe and moves along the inner side of the stainless steel water pipe through the inner moving mechanism 11. At the same time as the outer sleeve 1 moves, the first magnetic block 306 magnetically engages the second magnetic block. 1107 is pulled, causing the inner sleeve 2 to move synchronously. When the operator pushes the outer sleeve 1 to the weld, the inner sleeve 2 also moves synchronously to the weld. At this time, the first electric push rod 9 drives the outer grinding disc 10 to fit against the pipe wall. The first motor 6 drives the first rotating cylinder 4 to rotate through the first gear 8 and the outer gear ring 5, so that the outer grinding disc 10 grinds the outer side of the pipe wall. At the same time, the second motor 18 drives the second rotating cylinder 12 to rotate through the second gear 19 and the inner gear ring 17. Under the action of centrifugal force, the inner grinding disc 15 overcomes the tension of the tension spring 16 and moves outward and fits against the inner side of the pipe wall under the action of the limiting mechanism 21 to grind the weld.

[0040] The outer moving mechanism 3 also includes a first rotating rod 302, a second rotating rod 303, a connecting rod 305, and an outer moving wheel 304. An installation groove 301 is provided at the end of the outer sleeve 1. The first rotating rod 302 and the second rotating rod 303 are rotatably connected to the side wall of the installation groove 301. The two ends of the connecting rod 305 are hinged to the ends of the first rotating rod 302 and the second rotating rod 303, respectively. The outer moving wheel 304 is rotatably positioned at the hinge position between the first rotating rod 302 and the connecting rod 305. A locking assembly is provided at the upper end of the first rotating rod 302. A first magnetic block 306 is fixed to the connecting rod 305. The block 306 is threaded with an external fixing bolt 307. During use, the operator can adjust the angle of the first rotating rod 302 according to the specifications of the stainless steel water pipe to be polished and fix it with the locking component, so that the outer moving wheel 304 is in contact with the outer side of the pipe wall. At this time, under the action of the connecting rod 305 and the second rotating rod 303, the first magnetic block 306 is in contact with the outer side of the outer wall. When it is moved to the polishing position, the operator can tighten the external fixing bolt 307 to increase the friction between it and the stainless steel water pipe, thereby achieving the effect of fixing the outer sleeve 1, making the outer sleeve 1 more stable during the polishing process.

[0041] The locking assembly includes a sector plate 308 and a locking bolt 311. The sector plate 308 is fixed inside the mounting groove 301, and the sector plate 308 has several equally spaced adjustment holes 309. The first rotating rod 302 has a locking hole 310 aligned with one of the adjustment holes 309. The locking bolt 311 is threaded into the adjustment hole 309, and the end of the locking bolt 311 is inserted into the locking hole 310. According to the specifications of the stainless steel water pipe, the angle of the first rotating rod 302 is adjusted so that the locking hole 310 is aligned with the adjustment holes 309 at different positions. Then, the locking bolt 311 restricts the position of the locking hole, thereby fixing the first rotating rod 302.

[0042] The inner moving mechanism 11 includes a fixing component and fixing covers 1101 fixed at both ends of the inner sleeve 2. Each fixing cover 1101 is threaded with a threaded rod 1102. A synchronization component is provided between the two threaded rods 1102. A connecting piece 1103 is rotatably mounted on one end of the threaded rod 1102 located outside the inner sleeve 2. Several circumferentially distributed hinge seats 1104 are fixed at both ends of the inner sleeve 2. A third rotating rod 1124 is hinged to the hinge seat 1104, and an inner moving wheel 1106 is rotatably connected to the end of the third rotating rod 1124. A fourth rotating wheel 1106 is hinged to the connecting piece 1103. The moving rod 1105, and the middle position of the fourth rotating rod 1105 is hinged to the corresponding position of the third rotating rod 1124; in use, the operator can place the inner sleeve 2 inside the stainless steel water pipe, and then adjust the two threaded rods 1102 through the synchronization component. The threaded rods 1102 rotate and retract into the inner sleeve 2 while rotating. At this time, the third rotating rod 1124 can be pushed outward by the fourth rotating rod 1105, so that the inner moving wheel 1106 opens outward and abuts against the inner wall of the pipe. At this time, the inner sleeve 2 is squeezed and moves along the inside of the pipe.

[0043] The fixing assembly includes two fixing sleeves 1114 and several rubber anti-slip plates 1110. A second magnetic block 1107 is rotatably connected to the end of a fourth rotating rod 1105. An auxiliary rod 1108 is hinged to the second magnetic block 1107, and the other end of the auxiliary rod 1108 is hinged to a connector 1103. The auxiliary rod 1108 is parallel to the fourth rotating rod 1105. A groove 1109 is provided on the outer side of the second magnetic block 1107. The rubber anti-slip plates 1110 are fixed at the opening of the groove 1109. A connecting hole 1111 is provided on the inner wall of the groove 1109. The fixing sleeves 1114 are fixed to the inner wall of the inner sleeve 2, and the axes of the two fixing sleeves 1114 are collinear. A piston 1116 is slidably arranged inside the fixing sleeve 1114, and a second electric push rod 1117 is arranged between the two pistons 1116. The two ends of the second electric push rod 1117 are respectively fixedly connected to the two pistons 1116. The fixing sleeves 1114 are far away from the first magnetic block 1105. One end of the second electric actuator 1117 is connected to a vent pipe 1115. An annular pipe 1112 is fixed inside the fixed cover 1101. Several branch pipes 1113 are connected to the annular pipe 1112. Several round holes 1118 are opened on the inner sleeve 2. The other end of the branch pipe 1113 passes through the corresponding round hole 1118 and connects to the corresponding connecting hole 1111. The end of the vent pipe 1115 away from the fixed sleeve 1114 is connected to the annular pipe 1112. When the inner sleeve 2 moves to the appropriate position, the second electric actuator 1117 drives the two pistons 1116 to disperse on both sides, squeezing the gas inside the fixed sleeve 1114 into the groove 1109 through the vent pipe 1115, the annular pipe 1112 and the branch pipes 1113. At this time, the air pressure inside the groove 1109 increases, squeezing the rubber anti-slip plate 1110 outward, so that the rubber anti-slip plate 1110 is tightly attached to the inner wall of the stainless steel water pipe, thereby fixing the inner sleeve 2.

[0044] The synchronization assembly includes a central rod 1119 and two clamping rods 1121. The central rod 1119 is fixed to one of the threaded rods 1102, and the two clamping rods 1121 are symmetrically fixed to the other threaded rod 1102. The end of the central rod 1119 is located between the two clamping rods 1121. Slider blocks 1120 are fixed on both sides of the central rod 1119, and a groove 1122 is opened on the side of the clamping rod 1121 near the central rod 1119. The slider 1120 is slidably disposed in the groove 1122 at the corresponding position. An adjusting wheel 1123 is connected to one of the threaded rods 1102. When the operator rotates the adjusting wheel 1123, one of the threaded rods 1102 rotates. Under the action of the central rod 1119 and the clamping rods 1121, the two threaded rods 1102 rotate synchronously. When the two threaded rods 1102 move axially, the slider 1120 can slide along the groove 1122 without hindering the movement of the threaded rods 1102.

[0045] The limiting mechanism 21 includes an annular plate 2101 with several arc-shaped grooves 2102. Several limiting bolts 2103 are threaded onto the second rotating cylinder 12, passing through the arc-shaped grooves 2102. Several stepped grooves 2104 are formed on the inner side of the annular plate 2101. An L-shaped rod 2105 is connected to the end of the inner grinding disc 15, with the bottom of the L-shaped rod 2105 located within the stepped groove 2104. Depending on the specifications of the stainless steel water pipe, the operator can loosen the limiting bolts 2103 and then rotate the annular plate. 2101, so that the bottom of the L-shaped rod 2105 is aligned with different positions of the stepped groove 2104, and then the limiting bolt 2103 is tightened to fix the annular plate 2101. During the rotation of the second rotating cylinder 12, when the inner grinding disc 15 expands outward under the action of centrifugal force, the L-shaped rod 2105 will move accordingly. When the bottom of the L-shaped rod 2105 abuts against the side wall of the stepped groove 2104, it will hinder the outward expansion of the inner grinding disc 15, so that the maximum rotation diameter of the inner grinding disc 15 is consistent with the inner diameter of the stainless steel water pipe, preventing over-grinding.

[0046] The above-mentioned fixing methods are the most commonly used fixing connection methods in this field, such as welding and bolt connection; the above-mentioned electrical components, such as the first motor 6, the first electric push rod 9, the second motor 18 and the second electric push rod 1117, are all existing technology products that can be directly purchased and used on the market, and the specific principles will not be elaborated here.

[0047] Working principle of the invention:

[0048] Before use, depending on the specifications of the stainless steel water pipe, the operator can loosen the limiting bolt 2103 and then rotate the annular plate 2101 to align the bottom of the L-shaped rod 2105 with different positions of the stepped groove 2104. During use, the outer sleeve 1 is fitted onto the outside of the stainless steel water pipe to be polished. The operator can adjust the angle of the first rotating rod 302 and fix it with the locking bolt 311 and the sector plate 308 according to the specifications of the stainless steel water pipe, so that the outer moving wheel 304 is in contact with the outer wall of the pipe. At this time, under the action of the connecting rod 305 and the second rotating rod 303, the first magnetic block 306 is in contact with the outer wall. Pushed by the operator, it moves along the outer moving mechanism 3... The outer wall of the stainless steel water pipe moves, and the inner sleeve 2 is placed inside the stainless steel water pipe. The operator rotates the adjusting wheel 1123, causing one of the threaded rods 1102 to rotate. Under the action of the central rod 1119 and the clamping rod 1121, the two threaded rods 1102 rotate synchronously. As the threaded rods 1102 rotate, they retract into the inner sleeve 2. At this time, the third rotating rod 1124 can be pushed outward by the fourth rotating rod 1105, causing the inner moving wheel 1106 to open outward and abut against the inner wall of the pipe. At this time, the inner sleeve 2 is pressed and moves along the inside of the pipe. While the outer sleeve 1 moves, the first magnetic block 306 pulls the second magnetic block 1107 with magnetic force. The inner sleeve 2 moves synchronously. When the operator pushes the outer sleeve 1 to the weld, the inner sleeve 2 also moves synchronously to the weld. At this time, the operator can tighten the outer fixing bolt 307 to increase the friction between it and the stainless steel water pipe, thereby fixing the outer sleeve 1. Through the second electric push rod 1117, the two pistons 1116 are driven to disperse on both sides, squeezing the gas inside the fixing sleeve 1114 into the groove 1109 through the vent pipe 1115, the annular pipe 1112, and the branch pipe 1113. At this time, the air pressure inside the groove 1109 increases, squeezing the rubber anti-slip plate 1110 outward, so that the rubber anti-slip plate 1110 is tightly attached to the inner wall of the stainless steel water pipe, thereby fixing the inner sleeve 2. At this time, the first electric actuator 9 drives the outer grinding disc 10 to fit against the pipe wall. The first motor 6 drives the first rotating cylinder 4 to rotate through the first gear 8 and the outer gear ring 5, so that the outer grinding disc 10 grinds the outer side of the pipe wall. The second motor 18 drives the second rotating cylinder 12 to rotate through the second gear 19 and the inner gear ring 17. Under the action of centrifugal force, the inner grinding disc 15 overcomes the tension of the tension spring 16 and moves outward. At this time, the L-shaped rod 2105 will move with it. When the bottom of the L-shaped rod 2105 abuts against the side wall of the stepped groove 2104, it will hinder the outward expansion of the inner grinding disc 15, so that the maximum rotation diameter of the inner grinding disc 15 is consistent with the inner diameter of the stainless steel water pipe. The weld is ground by the inner grinding disc 15.

[0049] The preferred embodiments of this patent have been described in detail above. However, this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. A grinding device for inner and outer weld seams in the processing of thin-walled stainless steel water pipes, comprising an outer sleeve (1) and an inner sleeve (2), characterized in that, The outer sleeve (1) has several equally spaced external moving mechanisms (3) on both sides, and a first magnetic block (306) is provided in the external moving mechanism (3). A first rotating cylinder (4) is rotatably provided on the inner side of the outer sleeve (1). An external gear ring (5) is provided on the outer side of the first rotating cylinder (4). A first motor (6) is fixed on the outer side of the outer sleeve (1). A first gear (8) is fixed on the output shaft of the first motor (6). A first through hole (7) is provided on the outer sleeve (1). The first gear (8) passes through the first through hole (7) and meshes with the external gear ring (5). Several first electric push rods (9) are fixed on the inner side of the first rotating cylinder (4). An external grinding disc (10) is fixed at the end of the first electric push rod (9). An inner moving mechanism (11) is provided at both ends of the inner sleeve (2). Several second magnetic blocks (1107) are provided in the inner moving mechanism (11). A second rotating cylinder (12) is rotatably provided on the outer side of the inner sleeve (2). Several inner grinding discs (15) are provided on the outer side. Two sliding rods (14) are fixed on the inner side of the inner grinding discs (15). A sliding sleeve (13) is slidably provided on the sliding rods (14). The end of the sliding sleeve (13) is fixed to the second rotating cylinder (12). A tension spring (16) is sleeved on the outer side of the sliding sleeve (13). The two ends of the tension spring (16) are fixedly connected to the inner grinding discs (15) and the second rotating cylinder (12) respectively. A limiting mechanism (21) is provided on the second rotating cylinder (12). A second motor (18) is fixed on the inner side of the inner sleeve (2). A second gear (19) is fixed on the output shaft of the second motor (18). An internal gear ring (17) is provided on the inner side of the second rotating cylinder (12). A second through hole (20) is opened on the inner sleeve (2). The second gear (19) passes through the second through hole (20) and meshes with the internal gear ring (17). The inner moving mechanism (11) includes a fixing component and a fixing cover (1101) fixed at both ends of the inner sleeve (2). Both fixing covers (1101) are threaded with threaded rods (1102). A synchronization component is provided between the two threaded rods (1102). A connecting piece (1103) is rotatably provided at one end of the threaded rod (1102) located outside the inner sleeve (2). Both ends of the inner sleeve (2) are fixed with several circumferentially distributed hinge seats (1104). A third rotating rod (1124) is hinged on the hinge seat (1104), and an inner moving wheel (1106) is rotatably connected to the end of the third rotating rod (1124). A fourth rotating rod (1105) is hinged on the connecting piece (1103), and the middle position of the fourth rotating rod (1105) is hinged to the corresponding position of the third rotating rod (1124).The fixing assembly includes two fixing sleeves (1114) and several rubber anti-slip sheets (1110). The second magnet (1107) is rotatably connected to the end of the fourth rotating rod (1105). An auxiliary rod (1108) is hinged to the second magnet (1107), and the other end of the auxiliary rod (1108) is hinged to the connector (1103). The auxiliary rod (1108) is parallel to the fourth rotating rod (1105). A groove (1109) is provided on the outer side of the second magnet (1107), and the rubber anti-slip sheets (1110) are fixed in the opening of the groove (1109). At the groove (1109), a connecting hole (1111) is provided on the inner wall. The fixing sleeve (1114) is fixed on the inner wall of the inner sleeve (2), and the axes of the two fixing sleeves (1114) are collinear. A piston (1116) is slidably arranged inside the fixing sleeve (1114), and a second electric push rod (1117) is arranged between the two pistons (1116). The two ends of the second electric push rod (1117) are fixedly connected to the two pistons (1116) respectively. A vent pipe (1115) is connected to the end of the fixing sleeve (1114) away from the second electric push rod (1117). An annular tube (1112) is fixed inside the fixed cover (1101). Several branch tubes (1113) are connected to the annular tube (1112). Several round holes (1118) are opened on the inner sleeve (2). The other end of the branch tube (1113) passes through the round hole (1118) at the corresponding position and is connected to the connecting hole (1111) at the corresponding position. The end of the vent pipe (1115) away from the fixed sleeve (1114) is connected to the annular tube (1112). The synchronization component includes a central rod (1119) and two clamping rods (1121). The central rod (1119) is fixed. Two clamping rods (1121) are symmetrically fixed to the other threaded rod (1102) and the end of the central rod (1119) is located between the two clamping rods (1121). Slider blocks (1120) are fixed to both sides of the central rod (1119), and a groove (1122) is provided on the side of the clamping rod (1121) closest to the central rod (1119). The sliders (1120) are slidably positioned in the corresponding grooves (1122). An adjusting wheel (1123) is connected to one of the threaded rods (1102).

2. The device for grinding internal and external weld seams in the processing of thin-walled stainless steel water pipes according to claim 1, characterized in that, The external moving mechanism (3) further includes a first rotating rod (302), a second rotating rod (303), a connecting rod (305), and an external moving wheel (304). The outer sleeve (1) has an installation groove (301) at its end. The first rotating rod (302) and the second rotating rod (303) are rotatably connected to the side wall of the installation groove (301). The two ends of the connecting rod (305) are respectively hinged to the ends of the first rotating rod (302) and the second rotating rod (303). The external moving wheel (304) is rotatably set at the hinge position between the first rotating rod (302) and the connecting rod (305). The upper end of the first rotating rod (302) is provided with a locking component. The first magnetic block (306) is fixed on the connecting rod (305), and the first magnetic block (306) is threaded with an external fixing bolt (307).

3. The device for grinding internal and external weld seams in the processing of thin-walled stainless steel water pipes according to claim 2, characterized in that, The locking assembly includes a sector plate (308) and a locking bolt (311). The sector plate (308) is fixed inside the mounting groove (301), and the sector plate (308) has a plurality of equally spaced adjustment holes (309). The first rotating rod (302) has a locking hole (310) aligned with one of the adjustment holes (309). The locking bolt (311) is threaded into the adjustment hole (309), and the end of the locking bolt (311) is inserted into the locking hole (310).

4. The device for grinding internal and external weld seams in the processing of thin-walled stainless steel water pipes according to claim 1, characterized in that, The limiting mechanism (21) includes an annular plate (2101), on which several arc-shaped grooves (2102) are provided. Several limiting bolts (2103) are threaded onto the second rotating cylinder (12). The limiting bolts (2103) pass through the arc-shaped grooves (2102). Several stepped grooves (2104) are provided on the inner side of the annular plate (2101). An L-shaped rod (2105) is connected to the end of the inner grinding disc (15), and the bottom of the L-shaped rod (2105) is located in the stepped groove (2104).

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